.header {
    position: fixed;
    left: 0;
    right: 0;
    width: 100%;
    height: 1.0384615384615385rem;
    background-color: #ffd600;
    z-index: 100;
}
.header h3 {
   text-align: center;
   font-weight: 700;
   font-size: 0.3076923076923077rem;
   line-height: 1rem;
}
